President Donald Trump said John Bolton will no longer serve as his National Security Adviser, noting that the two "disagreed strongly" on many issues.

"I informed John Bolton last night that his services are no longer needed at the White House," Trump said in a tweet. "I disagreed strongly with many of his suggestions, as did others in the Administration."

Bolton's departure comes amid internal disagreements at the White House over recent negotiations with the Taliban on ending the war in Afghanistan. Trump said Monday that those talks are "dead."

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